• Aikaterini Amaniti, Panagiota Papakonstantinou, Dimitrios Gkinas, Ioannis Dalakakis, Evangelia Papapostolou, Anastasia Nikopoulou, Marianna Tsatali, Paul Zarogoulidis, Konstantinos Sapalidis, Christoforos Kosmidis, Charilaos Koulouris, Dimitrios Giannakidis, Konstantinos Romanidis, Panagoula Oikonomou, Nikolaos Michalopoulos, Aris Ioannidis, Kosmas Tsakiridis, Anastasios Vagionas, Isaak Kesisoglou, and Vasilios Grosomanidis.
• Department of Anesthesia and Critical Care, AHEPA University Hospital, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
• Medicina (Kaunas). 2019 Nov 27; 55 (12).

AbstractBackground and Objectives: Video laryngoscopy has been proven useful under difficult airway scenarios, but it is unclear whether anticipated improvement of visualization is related to specific difficult intubation prognostic factors. The present study evaluated the change in laryngoscopic view between conventional and C-MAC® laryngoscopy and the presence of multiple difficult intubation risk factors. Materials and Methods: Patients scheduled for elective surgery with >2 difficult intubation factors, (Mallampati, thyromental distance (TMD), interinscisor gap, buck teeth, upper lip bite test, cervical motility, body mass index (BMI)) were eligible. Patients underwent direct laryngoscopy (DL) followed by C-MAC™ laryngoscopy (VL) and intubation. Change of view between DL and VL, time for best view, intubation difficulty scale (IDS) and correlation between prognostic factors, laryngoscopic view improvement, and IDS were measured. Results: One-hundred and seventy-six patients completed the study. VL lead to fewer Cormarck-Lehane (C/L) III-IV, compared to DL (13.6% versus 54.6%, p < 0.001). The time to best view was also shorter (VL: 10.82 s, DL: 12.08 s, p = 0.19). Mallampati III-IV and TMD ≤ 6 cm were related to improvement of C/L between DL and VL. Logistic regression showed these two factors to be a significant risk factor of the glottis view change (p = 0.006, AUC-ROC = 0.57, 95% CI: 0.47-0.66). 175/176 patients were intubated with VL. 108/176 were graded as 0 < IDS ≤ 5 and 12/176 as IDS > 5. IDS was only correlated to the VL view (p < 0.0001). Conclusion: VL improved laryngoscopic view in patients with multiple factors of difficult intubation. Mallampati and TMD were related to the improved view. However, intubation difficulty was only related to the VL view and not to prognostic factors.

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